OAKLAND — There’s nothing revolutionary about Chip Kelly’s offense right now. Not even those cutting-edge signs used to signal plays in.

No touchdowns in two games? The signal for that is S.O.S.

If the Eagles have proven anything in their inaugural season with Kelly it’s that his offense isn’t for traditional quarterbacks and he’s going to need a bunch of nontraditional types to get through a season.

For Eagles players, including the defenders coming on strong, there’s no choice but to continue the testing today with Nick Foles taking on the Oakland Raiders at O.co Coliseum (4:05 p.m., Channel 29, WIP 94.1-FM).

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It’s not us. The players who sit in on the meetings and pore through the film see some of the same inadequacies.

Not long after Foles, the prototype pocket passer, was made the starter, the Eagles (3-5) became underdogs in this game.

And it’s not like Terrelle Pryor and the Raiders (3-4) are on a hot streak, although they’ve won two of their last three starts.

The skill sets of Foles, current backup Matt Barkley and the injured Michael Vick are vastly different, yet eminently defendable in the Kelly system. Lately the opposition hasn’t respected any of them or their fake handoffs from the shotgun formation starting almost every play. The fakes keep the defense honest and set up the run and pass.

“Obviously Mike demands so much respect and gets so much attention through his athletic ability,” Eagles running back LeSean McCoy said. “I think with Nick, I think his passing strength is kind of what they fear probably. A defense will play our quarterbacks all differently.”

A healthy Vick makes opponents respect the run. But that’s about it. At 6-foot, he has trouble finding the passing lanes. When the run is working, he can sit in the pocket and throw the play-action passes he’s so good at. When it isn’t, he holds the ball too long. Vick is 2-4 as the starter, the wins over teams with a collective 4-11 record.

Foles is 1-1 as the starter, the triumph over the winless Tampa Bay Buccaneers. He can make the throws against the Bucs and to a lesser extent the Giants, but is finding out that defensive linemen are just as fast, if not faster than him. And it’s a problem.

Barkley gets the up-tempo part of the offense but doesn’t have the deep accuracy to make opponents pay.

For Kelly, it starts with the run. Any week now McCoy is going to fall out of the NFL rushing lead. The opposition is flooding the box with extra defenders. The Eagles’ offense looks like the Mummers Parade. It’s not nearly as entertaining.

“Everything just seems so cluttered, so packed,” McCoy said. “The main goal of teams is they’re trying to stop the run. The passing game is secondary. A lot of times they give us a lot of (man-to-man) coverage and they dare us to beat them with the pass. But I think it all starts with the run. I think if we can work off the play-action we can get some balls out over the top.”

The Raiders rank 10th overall in defense and are allowing just 21.4 points per game. They’re also surrendering a shade less than 90 rushing yards, fifth in the league.

The Eagles have totaled 10 points in the last two games, the touchdown on a fumble recovery, and averaged 66 rushing yards. They averaged 27.6 points and 178.5 rushing yards in their 3-3 start.

Defensively the Eagles have bounced back from a difficult start. The Eagles have allowed 21 or fewer points in their last four games, a streak matched only by Andy Reid’s still-unbeaten Kansas City Chiefs.

No team has forced more punts over the last four games than the Eagles, who have gotten 26 out of the opposition.

Moreover the Eagles’ defense has held the opposition to less than 100 rushing yards the past four games, a skill necessary to beat the Raiders, as they average 139 yards rushing compared to just 176 yards passing. The 6-4, 233-pound Pryor makes it work. He’s 3-0 as the starter at home.

“When you play a team with an option quarterback like that you have to be very disciplined,” Eagles linebacker Connor Barwin said. “He brings more to it because he’s a good-sized quarterback and adds the element of a great athlete as well. You’ve got to get down when you tackle him because he’s got a good stiff-arm.”

The return of Foles could produce the deep throws the Eagles used to produce their last victory, three weeks ago over the Buccaneers.

McCoy and the offensive linemen, whose joint inability to finish plays has reduced opportunities, need to bounce back in a hurry to give the Eagles a chance to win.

Finally Foles, or whoever finishes the game at quarterback must at least play turnover-free. That would give the defense a chance to win it with possibly its first score of the season. Pryor has thrown five picks in his last two starts.

“It’s one of those things where you don’t really build up toward it but hopefully this is the week we make it happen,” Barwin said. “It’s an important game. We need to get a win.”